ELOG DESPEC

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

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Entry time:

Fri Mar 4 08:40:36 2022

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<h1>Grounding implemented</h1>

<ul>
	<li>Each FEE given direct connection to heavy duty earth bar via adaptor board lemo ground</li>
	<li>Earth bars are then connected to platform ground on AIDA frame</li>
	<li>Photo of grounding - attachment 1</li>
	<li>Improvements not as large as expected from previous experience though
	<ul>
		<li>Particularly in the n+n side where widths still appear awful</li>
	</ul>
	</li>
	<li>While implementing the grounding it was noticed the ground lemo socket on FEE7 was damaged and no longer gripped onto a lemo cable
	<ul>
		<li>It was noted that it would need changing at some point but continued with it for the time being</li>
	</ul>
	</li>
	<li>Jumper configuration was n+n LK1-4 all on, p+n LK2-4 all on</li>
</ul>

<h2>p+n widths</h2>

<table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:254px">
	<thead>
		<tr>
			<th scope="col">FEE</th>
			<th scope="col">Width</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td>9</td>
			<td>147</td>
		</tr>
		<tr>
			<td>1</td>
			<td>116</td>
		</tr>
		<tr>
			<td>10</td>
			<td>92</td>
		</tr>
		<tr>
			<td>11</td>
			<td>77</td>
		</tr>
		<tr>
			<td>3</td>
			<td>128</td>
		</tr>
		<tr>
			<td>12</td>
			<td>72</td>
		</tr>
		<tr>
			<td>13</td>
			<td>75</td>
		</tr>
		<tr>
			<td>5</td>
			<td>59</td>
		</tr>
		<tr>
			<td>14</td>
			<td>75</td>
		</tr>
		<tr>
			<td>15</td>
			<td>80</td>
		</tr>
		<tr>
			<td>7</td>
			<td>150</td>
		</tr>
		<tr>
			<td>16</td>
			<td>75</td>
		</tr>
	</tbody>
</table>

<ul>
	<li>Compared to the width with no grounding the FEEs for the first DSSD (First 6) range from no change to slightly worse</li>
	<li>1.8.L spectra - attachment 3</li>
</ul>

<h2>n+n widths</h2>

<ul>
	<li>Widths still very large</li>
	<li>Width for 8 is around 500</li>
	<li>1.8.L attachment 2</li>
</ul>

<h2>Additional info</h2>

<ul>
	<li>Statistics - attachment 4</li>
</ul>

<h1>Jumper optimisation</h1>

<ul>
	<li>Went to our previously found optimal jumper configuration for the trips</li>
	<li>n+n LK1 only</li>
	<li>p+n LK 2 and 4 on all FEE</li>
	<li>p+n LK3 on non isolated cables (PCB ground on lower middle cable and n+n side bias on top middle cable)</li>
	<li>While changing the jumpers we also swapped out the damaged adaptor board on aida07 for a new one</li>
	<li>Saw an improvement for most FEEs</li>
</ul>

<table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:275px">
	<thead>
		<tr>
			<th scope="col">FEE</th>
			<th scope="col">Width</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td>9</td>
			<td>134</td>
		</tr>
		<tr>
			<td>1</td>
			<td>83</td>
		</tr>
		<tr>
			<td>10</td>
			<td>80</td>
		</tr>
		<tr>
			<td>11</td>
			<td>68</td>
		</tr>
		<tr>
			<td>3</td>
			<td>60</td>
		</tr>
		<tr>
			<td>12</td>
			<td>60</td>
		</tr>
		<tr>
			<td>13</td>
			<td>71</td>
		</tr>
		<tr>
			<td>5</td>
			<td>60</td>
		</tr>
		<tr>
			<td>14</td>
			<td>75</td>
		</tr>
		<tr>
			<td>15</td>
			<td>82</td>
		</tr>
		<tr>
			<td>7</td>
			<td>97</td>
		</tr>
		<tr>
			<td>16</td>
			<td>77</td>
		</tr>
	</tbody>
</table>

<ul>
	<li>Unfortunately saw no improvement for the n+n</li>
	<li>We event tested having the pulser only going into a single FEE (aida08)</li>
	<li>Still have a width of 622 for that FEE</li>
	<li>To compare FEEs we have layout 1 - attachment 5</li>
	<li>Layouot 1 on a common timescale - attachment 6
	<ul>
		<li>Note that the rate is typically dominated by a single strip or a couple of strips within a FEE</li>
		<li>Many channels are just showing the pulser rate 25Hz</li>
	</ul>
	</li>
	<li>p+n&nbsp; 1.8.L attachment 7</li>
	<li>p+n waveforms attachment 8</li>
	<li>n+n waveforms attachment 9</li>
	<li>Testing the noise on the n+n strips we observe noise with slow comparator set to 200 (2MeV)</li>
	<li>Meanwhile the p+n strips are silent at 0x64 for the most part.</li>
	<li>DAQ left running overnight with 0x64 on ASIC settings to see if we observe any alphas</li>
</ul>

<ul>
	<li>Test daisy chaining the n+n across to the other n+n strips
	<ul>
		<li>Currently the n+n braid is only plugged into either aida06 or aida08 (depending on DSSD)</li>
		<li>All of the jumpers are however grounded</li>
		<li>Will still test</li>
		<li>May investigate also trying this on LK3 on adaptors for aida01 and aida03</li>
	</ul>
	</li>
	<li>Observe the output of the new sum inverter on the scope to check for variation in amplitude</li>
</ul>

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